Ground box



Dec. 4, 1928.

' R. M. ROBINSON GROUND BOX Original Fil ed Dec. 22. 1923 llvws/vrare 1Your N Eon/N50 a I I z d f firrvf Patented Dec. 4, 1928.

, UNITED, ST E rsNroFFics,

Bonner M. nonmsom or LOUISVILLE, KENTUCKY. sstenonro oHnA'rHAM iiLEo- V.

TRIC SWITCHING DEVICE 00., rnoonromrrnn, or nou svirrn, K Nr oKY, noon,

POBATION; OF. KENTUCKY.

GROUND Box; I

Original application filed December 22, 1923, Serial No. 682,235 Dividedand this application filed June 8 1925.

An object of my invention is to provide a ground box with a toggle jointof a novel kind in connection with switches for street railways and thelike. I Ieretofore a toggle has been employed which is spring pressed soas to keep a switch point rail at one limit or the other of its movementand prevent its stopping at dead center. A toggle embodying my inventionis articulated'so as to g1ve an additional movement to the member whichis directly driven by the compression spring so as to allow a strongerspring action to be obtained than is normally the case with theattendant greater security.

A further object of my invention is to provide means for a quickreplacement of the bearing and fulcrum means of the lever whenweardevelops. This and other objects are accomplished by my invention, oneembodiment of which is hereinafter more particularly set forth. 7

For a more particular description of my invention,reference is to be had'to themcompanying drawings, forming a part hereof,

in which v Figure l'is a plan View of a ground box embodying myinvention. 7

Figure'Q. is an enlarged plan view of the fulcrum and ournal shown inFigure 1. I

Throughout the various views of the drawings, similar referencecharacters designate similar parts.

The switch throwing lever 6 has a. clownwardly extending fulcrum 7 whichis suitably journaled against a base block 8 which is preferablyintegral with the casing 2 and this block 8 is slotted to receive a bolt9 that holds a journal'jaw 10 which has its other end resting against aprojection 11 which runs parallel to the part 8, but slightly separatedtherefrom, as shown in Figure 1. This jaw 10 can be adjusted by a nut onthe bolt'S) so as to bear against a large bushing 7 in which the.fulcrum 7 may move vfreely. The jaw 10 can be firmly clamped againstthis bushing by means of bolt 9 and at the same time bushing may beeasily renewed by loosening the nut at the back of bolt 9 swinging jaw10 away from bushing and lifting bushing out. I

While I am aware that other means have been made for the quickreplacement of the bushing of a ground box lever, they have been foundto be wanting in respect to per- Serial No. 35,766.

manency ife. under the very severepounding by the force exerted by theplunger and the resistance offered by the switch point, the bolt andclamp means become loosened. In my device where a superior leverage iseffected by reason of holding jaw 10 at its extreme ends, the entiredevice remains fixed until removed for replacement of the bushing.

Attention is called to the fact that by my.

arrangement the maximum amount of clamp- 111g force for the spaceavailable is procured.

It is even greatly'superior to using bolts at each end of aw 10for'securing it to part 8. Please note the fulcrum pointof 10 as beingat the most remote point against an i absolutely solid member 11 whichis cast integrally with the ground part and part 8. A further point ofsuperiority in my device resides in the fact that even though two boltswere used, it wouldnecessarily place the second one in close proximityto. the adjacent wall of the ground part thereby not giving sufiicie-ntroom for an ordinary wrench to operate a standard nut of the bolt to thedesired I claimv is:

ing a lever connected to the switch and fulcrumed in a bushing carriedby an integral ground box constructed with a grooved .block and a lugprojecting from one wall of the ground box, agrooved aw with one endabutting said lug andthe other end formed for the reception of a bolt, abushing interposed in the grooves of said jaw and said block between theends of said'jaw and a bolt so Having thus described my invention,what 1. In a switch throw mechanism. comprislocated and disposed as toclamp the bushing between the jaw and the block.

2. In a switch throw mechanism compris- 1 ing a: lever connected to theswitch and fulcrumed n a bushing carried by an integral ground boxconstructed with a grooved block and a lug projecting from one wall ofthe I I ground box, with the adjacent bottom area, closed, a grooved jawwith one end abutting i said lug and the other end formed forthereception of a bolt, a bushing interposed in t 5 the grooves of said jawand said block between the ends of said jaw and a, bolt so located anddisposed as to clamp the bushing between thejaw and the block, saidbushing'being so disposed as to haveits lower end closed by said adjacentbottom area.

Intestimony whereof, I have hereunto set my hand this 10th day ofApril,1925. i i

. ROBERT ML ROBINSON.

